slug
/slʌɡ/
"slug" is a 4-letter English headword indexed on PlainSpell.
The verdict
“slug” is a moderately-common English word, ranked #19,465 in English word frequency and used as a noun.
- #19,465
- frequency rank, English
- 4
- letters
- 6
- tracked misspellings
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Any of many gastropod mollusks, having no (or only a rudimentary) shell.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | slug |
| Language | English |
| Part of speech | Noun |
| IPA | /slʌɡ/ |
| Letters | 4 |
| Frequency rank | #19,465 |
| Misspellings tracked | 6 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Where “slug” sits in English frequency
Spelling & Dictionary Insight
The English entry for slug is 4 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /slʌɡ/. Corpus data places it at rank #19,465 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 20 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 6 likely wrong-spelling variants for slug, with forms such as "lsug", "slgu", and "sllug". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 20 confusable-pair relationships, "su", "sun", "sub", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
Etymologically, the entry records: Originally referred to a slow, lazy person, from Middle English slugge (“lazy person", also "sloth, slothfulness”), probably of either Old English or Old Norse origin; perhaps ultimately from Proto-Indo-European *sliǵ-ōn, from *sley- (“smooth; slick; sticky… The correct English form is slug, spelled S-L-U-G.
Definition
- 1Any of many gastropod mollusks, having no (or only a rudimentary) shell.
- 2A slow, lazy person; a sluggard.
- 3A bullet or other projectile fired from a firearm; in modern usage, generally refers to a shotgun slug.
- 4A solid block or piece of roughly shaped metal.
- 5A counterfeit coin, especially one used to steal from vending machines.
- 6A shot of a drink, usually alcoholic.
- 7A title, name or header, a catchline, a short phrase or title to indicate the content of a newspaper or magazine story for editing use.
- 8The imperial (English) unit of mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it.
- 9A discrete mass of a material that moves as a unit, usually through another material.
- 10A motile pseudoplasmodium formed by amoebae working together.
- 11An accessory to a diesel-electric locomotive, used to increase adhesive weight and allow full power to be applied at a lower speed. It has trucks with traction motors, but lacks a prime mover, being powered by electricity from the mother locomotive, and may or may not have a control cab.
- 12A black screen used to separate broadcast items.
- 13A piece of type metal imprinted by a linotype machine; also a black mark placed in the margin to indicate an error; also said in application to typewriters; type slug.
- 14A stranger picked up as a passenger to enable legal use of high occupancy vehicle lanes.
- 15A hitchhiking commuter.
- 16The last part of a clean URL, the displayed resource name, similar to a filename.
- 17A hindrance, an obstruction.
- 18A ship that sails slowly.
- 19A block of text at the beginning of a scene that sets up the scene's location, characters, etc.
- 20An infertile egg of a reptile.
Etymology
Originally referred to a slow, lazy person, from Middle English slugge (“lazy person", also "sloth, slothfulness”), probably of either Old English or Old Norse origin; perhaps ultimately from Proto-Indo-European *sliǵ-ōn, from *sley- (“smooth; slick; sticky; slimy”) or otherwise from the root of Old Norse slókr (“lazy person, oaf”), whence Icelandic slókur (“laziness”). Compare Norn slug (“lazy, slothful, sluggish”), dialectal Norwegian slugg (“a large, heavy body”), sluggje (“heavy, slow person”), Danish slog (“rascal, rogue”). Compare also Dutch slak (“snail, slug”). Doublet of slotch. The sense of a hitchhiking commuter is from the sense of a counterfeit bus token. Bus operators considered sluggers to be cheating as if they were using counterfeit tokens.
Synonyms
This word in other languages
Common misspellings
Also misspelled as: lsug,slgu,sllug,slugg,sslug,sulg
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of slug - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “slug”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-L-U-G - every other letter order is a misspelling in standard orthography.
- Say it as /slʌɡ/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “su” - see the side-by-side comparison. slug vs su
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.